diff --git a/source b/source
index a2fb0bdf235..ca1a29f4782 100644
--- a/source
+++ b/source
@@ -4126,6 +4126,8 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
     <ul class="brief">
      <li><dfn data-x-href="https://storage.spec.whatwg.org/#obtain-a-local-storage-bottle-map">obtain a local storage bottle map</dfn></li>
      <li><dfn data-x-href="https://storage.spec.whatwg.org/#obtain-a-session-storage-bottle-map">obtain a session storage bottle map</dfn></li>
+     <li><dfn data-x-href="https://storage.spec.whatwg.org/#obtain-a-storage-key-for-non-storage-purposes">obtain a storage key for non-storage purposes</dfn></li>
+     <li><dfn data-x-href="https://storage.spec.whatwg.org/#storage-key-equal">storage key equal</dfn></li>
      <li><dfn data-x-href="https://storage.spec.whatwg.org/#storage-proxy-map">storage proxy map</dfn></li>
      <li><dfn data-x-href="https://storage.spec.whatwg.org/#legacy-clone-a-browsing-session-storage-shed">legacy-clone a browsing session storage shed</dfn></li>
     </ul>
@@ -102375,6 +102377,10 @@ interface <dfn interface>BroadcastChannel</dfn> : <span>EventTarget</span> {
    <li><p>Let <var>sourceOrigin</var> be <span>this</span>'s <span>relevant settings object</span>'s
    <span data-x="concept-settings-object-origin">origin</span>.</p></li>
 
+   <li><p>Let <var>sourceStorageKey</var> be the result of running <span>obtain a storage key for
+   non-storage purposes</span> with <span>this</span>'s <span>relevant settings
+   object</span>.</p></li>
+
    <li>
     <p>Let <var>destinations</var> be a list of <code>BroadcastChannel</code> objects that
     match the following criteria:</p>
@@ -102382,9 +102388,9 @@ interface <dfn interface>BroadcastChannel</dfn> : <span>EventTarget</span> {
     <ul>
      <li><p>They are <span>eligible for messaging</span>.</p></li>
 
-     <li><p>Their <span>relevant settings object</span>'s <span
-     data-x="concept-settings-object-origin">origin</span> is <span>same origin</span> with
-     <var>sourceOrigin</var>.</p></li>
+     <li><p>The result of running <span>obtain a storage key for non-storage purposes</span> with
+     their <span>relevant settings object</span> <span data-x="storage key equal">equals</span>
+     <var>sourceStorageKey</var>.</p></li>
 
      <li><p>Their <span>channel name</span> <span>is</span> <span>this</span>'s <span>channel
      name</span>.</p></li>